An unzoned mineral that is typically zoned at minimal-medium metamorphic grades has both expert superior temperature conditions or was in no way zoned (owing to an easy reaction heritage at confined P-T or to advancement completely at large-T). Reaction textures Some metamorphic rocks consist of proof for incomplete reactions or other textural proof for part of the P-T path. A simple instance may be the partial alternative of andalusite by sillimanite (Fig. 6a) because of the polymorphic transformation of andalusite to sillimanite. Textural proof may be practical in cases where the reactants happen to be entirely consumed if the shape of one or more reactants are preserved; by way of example, pseudomorphs (Figs. 6b-d). An illustration website of a more complicated reaction texture entails the development of coronas , which include a number of shells (rims, moats) of the mineral or minerals around a central (reactant) section (Fig. 6e). In many scenarios, coronas also include the great-scale intergrowth of minerals in the texture referred to as symplectite (Figs. 6e-file).
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simply because we would like as much P-T path facts as possible, In order to be able to interpret the thermal/tectonic processes and heritage at the same time as possible. This is often undesirable
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